Colpi, M.; Bonfanti, C.; Boselli, A.; Cortese, L.; Arosio, I.; Gavazzi, G.; Decarli, R. The census of nuclear activity of late-type galaxies in the Virgo cluster. Monthly Notices of the Royal Astronomical Society. 2007-07-06, 381 (1): 136–150. Bibcode:2007MNRAS.381..136D. arXiv:0707.0999. doi:10.1111/j.1365-2966.2007.12208.x(英语).
Binggeli, B.; Sandage, A.; Tammann, G. A. Studies of the Virgo Cluster. II - A catalog of 2096 galaxies in the Virgo Cluster area.. The Astronomical Journal. 1985-09-01, 90: 1681–1759. Bibcode:1985AJ.....90.1681B. ISSN 0004-6256. doi:10.1086/113874.
Colpi, M.; Bonfanti, C.; Boselli, A.; Cortese, L.; Arosio, I.; Gavazzi, G.; Decarli, R. The census of nuclear activity of late-type galaxies in the Virgo cluster. Monthly Notices of the Royal Astronomical Society. 2007-07-06, 381 (1): 136–150. Bibcode:2007MNRAS.381..136D. arXiv:0707.0999. doi:10.1111/j.1365-2966.2007.12208.x(英语).
Binggeli, B.; Sandage, A.; Tammann, G. A. Studies of the Virgo Cluster. II - A catalog of 2096 galaxies in the Virgo Cluster area.. The Astronomical Journal. 1985-09-01, 90: 1681–1759. Bibcode:1985AJ.....90.1681B. ISSN 0004-6256. doi:10.1086/113874.
Colpi, M.; Bonfanti, C.; Boselli, A.; Cortese, L.; Arosio, I.; Gavazzi, G.; Decarli, R. The census of nuclear activity of late-type galaxies in the Virgo cluster. Monthly Notices of the Royal Astronomical Society. 2007-07-06, 381 (1): 136–150. Bibcode:2007MNRAS.381..136D. arXiv:0707.0999. doi:10.1111/j.1365-2966.2007.12208.x(英语).
Binggeli, B.; Sandage, A.; Tammann, G. A. Studies of the Virgo Cluster. II - A catalog of 2096 galaxies in the Virgo Cluster area.. The Astronomical Journal. 1985-09-01, 90: 1681–1759. Bibcode:1985AJ.....90.1681B. ISSN 0004-6256. doi:10.1086/113874.